<div style="position: absolute; margin-top: 50px; margin-left: 200px;">
    <div class="btn-group">
        <a href="" class="btn btn-default" >Inicio</a>
        <a href="#" class="btn btn-default" >Agenda</a>
    </div>
</div>
<div style="position: absolute; margin-top: 120px; width: 100%">
    <div style="float: left; width: 200px;">
        <div class="panel panel-default">
            <div class="btn-group-vertical" style="width: 100%">
                <a href="#" class="btn btn-default dropdown-toggle">Agenda</a>
            </div>
        </div>
    </div>
    <div style="float: left; width: 80%" class="panel-danger">
        <div class="panel panel-default">
            <div class="panel-body">